def fold_size
import mlbend-select@0.1.0.0/main.bend as MlbendSelectimport Base
import mlbend-split@0.1.1.0/main.bend as Split
39# The number of rows of the fold f.
40def fold_size(fs: List<&2, Nat>, f: Nat) -> Nat:
41 List.length(&2, Nat, Split.test_of(fs, f))